<html>
<meta charset="UTF-8">
<style>
div{
	margin:10px;
	width:500px;
	height:200px;
	border: 1px solid green;
}
</style>
<head>

</head>
<body>
	<h1>策略模式</h1>
	<form action="test.php" method="post">
		<input type="text" name="left" />
		<select id="select" name="operate">
			<option value="add">+</option>
			<option value="sub">-</option>
			<option value="mul">*</option>
			<option value="div">/</option>
		</select>
		<input type="text" name="right" />
		<p><input type="submit" value="计算" /></p>
	</form>
</body>









</html>	
